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Sigma makes lenses with a variety of mounts to fit a variety of cameras. A lens with a Canon mount won't fit onto a Nikon camera, for example. Assuming the lens has the proper mount for your camera, it should fit fine.

Hi darciegracem, Does this happen with the MB-16 battery pack using AA batteries? If so clean the contacts on the battery pack and inside the camera. Make sure it is screwed snug to the camera. If it happen when using the two 123 batteries as well, it may need a trip to Nikon. These cameras go used for about $100 or less thus, you may not want it repaired but, rather purchase a used one from a reputable dealer. The F80/N80 is a very nice camera.

I'm unfamiliar with the F80 but on models like the f65 and f75 the viewfinder screen has an lcd overlay and when the battery is exhausted or removed the viewfinder goes dark and blurry.

Looking at a picture of the f80 it looks like it's just an update on my f75 so it strongly suggests that you just need to insert a fresh battery. The lcd does draw power from the battery even with the camera turned off.

I hope that you found my answer useful, once you've tried another battery to confirm what I've suggested I'd appreciate it if you return the favour by rating my answer.